Immortality- Culebras do not age or decay and are immune to death by disease or sickness.
Accelerated Healing- Culebras heal from physical wounds much faster than humans. In addition, chronic illnesses, such as poor vision, are immediately corrected. For example, Richie was shot in the hand and had a large hole that caused him immense pain if too much pressure was applied to it. Upon transformation, the large wound healed rapidly and his vision was heightened, no longer requiring him to wear glasses.
Superhuman Strength- Doc has more strength than a regular human.
Shapeshifting- Doc can shape-shift into a reptilian form that is far stronger and more feral than their human form. It causes them to mentally degenerate into mindless animals that can be killed easier as they are not as smart in a fight and are more blood crazed, though when partially transformed, they are simply more aggressive and can speak, while other are more like hungry zombies and even hunt in hoards or packs. They either have flaked or scaly skin with sometimes hardened scales and horns.